Specifications include, but are not limited to: The purpose of these specifications is to describe a vehicle-mounted enhanced lightbar that is capable of traffic control full matrix dynamic message sign (DMS). Such signs may also be referred to as Variable Message Signs, Changeable Message Signs, Electronic Signs and Active Signs. The DMS shall allow mounting to a vehicle in a variety of atachment configurations. The DMS shall allow operation while moving at freeway speeds or while parked. The unit shall be operated from the 12 VDC vehicle electrical system. DMS Operation; The DMS shall be capable of displaying character or graphics information. The DMS shall be controlled through any device that can connect to the sign controllers local WiFi network. No cellular signal shall be required. The system shall capable of 99 predefined messages including messages that will provide arrows and chevrons. The standard font shall be 7 pixels wide by 12 pixels high and double stroked and capable of 7 pixels wide by 5 pixels high. Equipment Components; DMS Display Modules; The DMS shall be made up of display modules which shall contain four (4) LEDs per pixel and pixel spacing of 44mm”. The modules shall be of an environmentally sealed weatherproof design with a rectangular configuration of 12 pixels by 8 pixels. The pixel design shall provide for a 30-degree wide viewing angle. The body of the module shall be composed of UV-inhibited, high impact, ABS thermo plastic material and be environmentally sealed against contaminants. The display modules shall operate in a temperature range of -34 C to 74 C without environmental controls such as heating and air conditioning. The display modules shall be capable of withstanding harsh vibration and environmental conditions as set forth by NEMA TS 4. The display modules shall have an IP64 certification for dust and water protection under the International Standard IEC 60529 Edition 2.1. The display modules shall be replaceable within approximately five minutes using simple hand tool, which shall be provided with each sign. The display modules shall be fully interchangeable with no addressing, dip switch settings or other adjustments.
